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14 Cards in this Set
- Front
- Back
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atom
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the smallest unit of an element that maintains the properties of that element
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atomic mass unit
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a unit of mass that is exactly 1/12 the mass of a carbon-12 atom, or 1.660540*10^-27 kg
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atomic number
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the number of protons in the nucleus of each atom of an element
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average atomic mass
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the weighted average of the atomic masses of the naturaly occurring isotopes of an element
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Avogadro's number
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6.0221367*10^23 or the number of particles in exactly one mole of pure substance
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isotopes
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atoms of the same element that have different masses
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law of conservation of mass
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mass is neither created nor destroyed during ordinary chemical or physical reactions
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law of definite proportions
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a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or the source of the compound
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law of multiple proportions
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if two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers
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mass number
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the total number of protons and neutrons in the nucleus of an isotope
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molar mass
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the mass of one mole of pure substance
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mole
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the amount of substance that contains as many particles as there are atoms in exactly 12 g of carbon-12
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nuclear force
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a short-range proton-neutron, proton-proton, or neutron-neutron force that holds the nuclear particles together
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nuclide
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the general term for any isotope of any element
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